Least CPU Usage- Real Monitor or Apple Remote Desktop

Hello,
What would require the least processing power of a Mac Pro; a 24 inch monitor run via a DVI cable or the same image accessed via Apple Remote Desktop software and displaying the screen on another Mac? Here is the rest of the story...
I am designing a home video surveillance system built around a Mac Pro and SecuritySpy. It will coordinate 12 network cameras (HD quality) and the potential load of the cameras alone will be huge. My goal is to place the Mac Pro in a locked network closet and administer it remotely. I can either go the Apple Remote Desktop route or have the monitor signal sent via an ethernet adapter, but the aim is to tax the CPU the least.
So, what are your thoughts?
“Technological change is like an axe in the hands of a pathological criminal.” (Albert Einstein, 1941),
Dr. Z.

Hatter,
Well, the network closet will indeed have it's own dedicated air conditioning unit, so the heat issue should be addressed. However, initial calculations with the possibility of capturing twelve 0.8 Megapixel H.264 video streams at the same time would cripple any current Mac Mini model. Only a 2.93 GHz 12-core Mac Pro could handle this kind of load, and even then, at only 6 frames per second. Obviously I am very anxious to see what Apple will release with it's next line of Mac Pro's (if they don't kill firther production as rumored). I might also be interested in a Mac Mini cluster, but that would cost even more money in the long run.
So, back to my original question. Anyone?
More microchiops than sense,
Dr. Z.

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